Structure, morphology and photoluminescence emissions of ZnMoO4: RE 3+ = Tb3+ - Tm3+ - X Eu3+ (x=1, 1.5, 2, 2.5 and 3 mol%) particles obtained by the sonochemical method

JOURNAL OF ALLOYS AND COMPOUNDS

卷:750

Article

Lovisa, L. X.¹  Oliveira, M. C.²  Andres, J.²  Gracia, L.³  Li, M. S.⁴  Longo, E.⁵  Tranquilin, R. L.¹  Paskocimas, C. A.¹  Bomio, M. R. D.¹  Motta, F. V.¹ 

[1] Univ Fed Rio Grande do Norte, DEMAT, LSQM, BR-59078900 Natal, RN, Brazil

[2] Univ Jaume 1, Dept Quim Fis & Analit, Campus Riu Sec, E-12071 Castellon de La Plana, Spain

[3] Univ Valencia, Dept Quim Fis, E-46100 Burjassot, Spain

[4] Univ Sao Paulo, IFSC, Av Trabalhador Sao Carlense 400, BR-13566590 Sao Carlos, SP, Brazil

[5] UNESP, IQ, LIEC, Rua Francisco Degni S-N, BR-14801907 Araraquara, SP, Brazil

关键词: ZnMoO4: Tb3+;    Tm3+;    Eu3+;    Sonochemical method;    Photoluminescence;   

DOI  :  10.1016/j.jallcom.2018.03.394

来源: Elsevier

【 摘 要 】

ZnMoO4 and ZnMoO4: RE3+ 1% Tb3+, 1% Tm3+, x Eu3+ (x=1, 1.5, 2, 2.5 and 3 mol%) particles were prepared by a sonochemical method. The influence of the dopant content on photoluminescent behavior was investigated. The X-ray diffraction results confirmed the formation of the alpha-ZnMoO4 phase with a triclinic crystalline structure. The influence of the chemical compositions on photoluminescence emissions has been studied and the results clearly show the specific emissions of Tb3+ and Eu3+, simultaneously, with a strong contribution of the matrix. Band gap values are in the range of 3.55-4.25 eV. From the values calculated for the CIE coordinates, it was observed that this material develops an emission tendency in the orange-red region. It has been demonstrated for the first time that the sample ZnMoO4: 1% Tb3+, 1% Tm3+, 2% molEu(3+), presented higher photoluminescence intensity. At higher concentrations of RE3+, the quenching effect was observed. The morphology of samples are interpreted based on a comparative analysis of the calculated and experimental field emission scanning electron microscopy (FE-SEM) images. First-principle calculations at a density functional theory level were performed to obtain the values of surface energies and relative stability of the (120), (001), (011), (201), and (100) surfaces by employing the Wulff construction. A complete map of the available morphologies of ZnMoO4 and ZnMoO4:12.5%molEu(3+) is obtained and a possible explanation for the transformation processes is provided in which the experimental and theoretical morphologies can match. The present study offers a fundamental knowledge that is expected to enable the fabrication of ZnMoO4-based phosphor materials with a controllable emission peak shift and intensity. (C) 2018 Elsevier B.V. All rights reserved.

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